EP2809971A1 - Passive shutdown sealing device for a system of shaft seals of a reactor coolant pump unit - Google Patents

Passive shutdown sealing device for a system of shaft seals of a reactor coolant pump unit

Info

Publication number
EP2809971A1
EP2809971A1 EP13702052.5A EP13702052A EP2809971A1 EP 2809971 A1 EP2809971 A1 EP 2809971A1 EP 13702052 A EP13702052 A EP 13702052A EP 2809971 A1 EP2809971 A1 EP 2809971A1
Authority
EP
European Patent Office
Prior art keywords
pump unit
primary pump
passive
seal system
ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13702052.5A
Other languages
German (de)
French (fr)
Other versions
EP2809971B1 (en
Inventor
Romain THUILLIER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Areva NP SAS
Original Assignee
Areva NP SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Areva NP SAS filed Critical Areva NP SAS
Priority to SI201330224A priority Critical patent/SI2809971T1/en
Publication of EP2809971A1 publication Critical patent/EP2809971A1/en
Application granted granted Critical
Publication of EP2809971B1 publication Critical patent/EP2809971B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
    • F16J15/188—Split assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/14—Shaft sealings operative only when pump is inoperative
    • F04D29/146—Shaft sealings operative only when pump is inoperative especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/08—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being radioactive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/002—Sealings comprising at least two sealings in succession
    • F16J15/008—Sealings comprising at least two sealings in succession with provision to put out of action at least one sealing; One sealing sealing only on standstill; Emergency or servicing sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/26—Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings
    • F16J15/28—Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings with sealing rings made of metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/54—Other sealings for rotating shafts

Definitions

  • the field of the invention is that of the primary pump units of pressurized water nuclear reactors (PWRs).
  • PWRs pressurized water nuclear reactors
  • the invention further relates to a passive off-line seal (DEA) for controlling a primary coolant leak resulting from the failure of the seal system present on the primary pump unit.
  • DEA passive off-line seal
  • the stationary sealing devices must be able to control and stop a leakage of the primary coolant resulting from the failure of the group seal system. primary motor pump.
  • this type of device is activated by an auxiliary source (such as for example a pressurized nitrogen circuit) and the triggering is controlled by information delivered by the control command of the reactor, in case of loss of the cooling sources of the reactor.
  • auxiliary source such as for example a pressurized nitrogen circuit
  • the invention aims to propose an improvement of such a sealing device to ensure the activation of the sealing device and its proper operation during an accident situation.
  • a passive shutdown sealing device for a primary pump unit shaft seal system comprising:
  • a split seal ring having an inactivated position in which a leakage rate is allowed and an activated position in which said ring stops said leakage rate
  • At least one piston adapted to position said split seal ring in its activated position
  • locking / unlocking means adapted to lock said at least one piston in its inactivated position when the temperature of said locking / unlocking means is below a temperature threshold, and to release said at least one piston when the temperature of said locking / unlocking means is greater than said temperature threshold;
  • the design of the device according to the invention allows a simplified implementation on the architectures of the primary pump units already in service.
  • the device according to the invention it is also possible to adjust the device to the operating constraints of each type of nuclear reactor by adjusting the self-activation temperature of the device, and more specifically by modifying the composition. of the fuse element.
  • the passive stopping device according to the invention may also have one or more of the following characteristics taken individually or in any technically possible combination:
  • said device is adapted to be integrated on a system of joints of a primary pump unit shaft in use;
  • said ring comprises a chamfered side wall adapted to cooperate with a chamfered wall of said at least one piston;
  • said locking / unlocking means are adapted to degrade mechanically from a temperature threshold of between 80 ° C. and 200 ° C., advantageously equal to 150 ° C .;
  • sealing ring is made of a polymeric material resistant to temperatures above 300 ° C .
  • sealing ring is made of PEEK
  • sealing ring is made of a PEEK matrix composite loaded with glass fiber or carbon fiber;
  • said sealing ring is made of a metallic material
  • said sealing ring is a composite material formed by a metal core and coated with a more malleable material than said metal core;
  • said material which is more malleable than said metal core is a polymer or nickel or silver
  • said elastic means are helical compression springs or wave springs or spring washers
  • the device comprises a plurality of pistons and a plurality of locking / unlocking means distributed around the periphery of said ring, said pistons and said locking / unlocking means being spaced angularly from each other by a constant angle;
  • said device comprises three pistons and three locking / unlocking means
  • - Said device comprises a split ring integrated in said sealing ring and adapted to seal said device in case of degradation of said ring.
  • the subject of the invention is also a primary pump unit comprising:
  • a seal system adapted to achieve a controlled leak established along a leak path arranged along the pump pump shaft of the primary pump unit;
  • a passive stopping device adapted to at least partially close said leakage path of said seal system when said seal system fails and when said sealing ring is activated, so as to achieve a controlled leakage.
  • FIG. 1 illustrates a partial sectional view of a joint system of a primary motor pump unit.
  • FIG. 2 illustrates a passive stopping device according to the invention in its rest position integrated in a joint system of a primary motor pump unit;
  • FIG. 3 illustrates the stop device according to the invention, illustrated in Figure 2, in its activated position.
  • the primary pumps of pressurized water reactors are centrifugal type with vertical axis.
  • the dynamic seal at the shaft outlet 10 (FIG. 1) is ensured by a joint system consisting of three stages.
  • the first floor is called seal no.
  • the seal No. 1, referenced J1 is a hydrostatic seal leak controlled. In normal operation, a leakage flow, illustrated by the arrow F1, is established along the shaft 10.
  • Figure 1 shows more particularly the leakage path F1 along the shaft 10 between the seal No. 1 and the seal No. 2 (not shown) located upstream of the seal No. 1.
  • the device DEA 20 according to the invention is positioned on the escape path F1 so as to block the flow of the leakage flow along the shaft 10 in an accident situation.
  • FIG. 2 illustrates more particularly the sealing device 20 during normal operating conditions of the primary pump unit, that is to say when the temperature of the leakage flow rate is lower than a threshold value.
  • FIG. 3 more particularly illustrates the sealing device during accidental operating situations of the primary pump unit, that is to say when the temperature of the leakage flow rate is greater than a threshold value.
  • the stationary sealing device 20 according to the invention comprises:
  • a split sealing ring 23 concentrically positioned around the pump shaft 10 of the primary pump unit
  • - Piston type means 22 adapted to constrain the split seal ring 23 in a more closed position than that corresponding to its operating position in which the leakage path is not obstructed;
  • - Locking / unlocking means 25 formed by a fuse ring for locking the position of the pistons 22 in a position, said rest position, when the leakage flow temperature is below a predetermined threshold value, and to unlock the position of the pistons 22 from their rest position so as to reach a position, called the activated position, when the temperature of the leakage flow rate is greater than or equal to the predetermined threshold value;
  • - Elastic means 24 such as for example compression springs, adapted to move axially the different pistons
  • the pistons 22 are distributed around the circumference of the sealing ring 23.
  • the sealing ring 23 has a first stepped side wall 33 whose slope is adapted to cooperate with the chamfered wall 32 at the bottom of the pistons 22.
  • the contact between the piston 22 and the split sealing ring 23, and more particularly between the chamfered wall 32 of the piston and the chamfered wall 33 of the sealing ring 23, is provided by a plurality of elastic means 24, for example helical compression springs, wave springs, spring washers, distributed around the circumference of the sealing ring 23 and exerting a force on the pistons 22.
  • the pistons 22 comprise bores 34 adapted to partially or totally house the elastic means 24.
  • the locking / unlocking means 25 are formed by a fuse ring made of polymer material chosen as a function of its degradation temperature and its loss of its mechanical characteristics from a given temperature threshold.
  • the device comprises three pistons 22 and three resilient means 24 distributed at 120 ° on the circumference of the pump shaft 10 of the primary pump unit.
  • the increase in the temperature of the leakage flow has the effect of increasing the temperature in the vicinity of the stop device 20, and in particular the temperature of the fusible ring 25.
  • a threshold value predefined according to the nature of the fusible ring 25, it degrades thereby no longer ensuring sufficient strength to withstand the effort generated by the plurality of means
  • the melting of the fuse ring 25 during the increase in temperature thus makes it possible to trigger the device 20 by unlocking the pistons 22.
  • the axial displacement of the pistons 22 generates a radial force on the sealing ring 23 via the chamfered wall 32 of the pistons slidingly cooperating with the chamfered wall 33 of the sealing ring 23.
  • the sealing ring 23 ensures the blocking of the escape path F1 thanks to the force exerted by the elastic means 24 and also by the autoclave effect induced by the increase of the pressure upstream of the sealing device 20 in the activated position.
  • the sealing ring 23 has, on its second lateral wall 34, a shoulder adapted to incorporate a split ring 26, called anti-extrusion ring.
  • the split ring 26 is adapted to ensure optimum sealing of the stop device especially when, during an exceptional situation, the temperature is such that the mechanical characteristics of the sealing ring 23 are degraded.
  • the choice of the polymer of the fuse ring 25 is made so that it can withstand the force exerted by the elastic means 24 to a single temperature between 80 ° C and 200 ° C and advantageously equal at 150 ° C.
  • the sealing ring 23 of the stop device 20 may be made of a polymer material resistant to high temperatures (ie greater than 300 ° C.), such as, for example, PEEK or a PEEK composite filled with glass fibers or of carbon.
  • a polymer material resistant to high temperatures such as, for example, PEEK or a PEEK composite filled with glass fibers or of carbon.
  • the split sealing ring 23 of the device 20 may also be made of a metallic material.
  • a metallic material makes it possible to secure the holding of the device and in particular of the sealing ring in the event of activation of said device before complete stopping of the rotation of the pump shaft.
  • the split sealing ring 23 may also be made of a composite material formed by a metal core coated with a more malleable material than the core, such as for example a polymer, nickel or silver.
  • the peripheral material more malleable than the core will fill the existing gaps between the different pieces by deformation of the surface layer.
  • the denser metal core makes it possible to guarantee a limitation of the leakage rate.
  • the pistons 22 and the split anii-extrusion ring 26 are advantageously made of stainless steel type metal materials.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

The present invention relates to a passive shutdown sealing device (20) for a reactor coolant pump unit comprising: a split sealing ring (23) having an inactivated position in which a leakage flow is permitted and an activated position in which said ring stops said leakage flow; at least one piston (22) designed to position said split sealing ring (23) in its activated position; locking/unlocking means (25) designed to lock said at least one piston (22) in its inactivated position when the temperature of said locking/unlocking means is below a temperature threshold and to release said at least one piston (22) when the temperature of said locking/unlocking means is above said temperature threshold; elastic means (24) designed to move said at least one piston (22) when said piston is released, so as to position said sealing ring (23) in its activated position.

Description

DISPOSITIF D'ETANCHEITE A L'ARRET PASSIF  PASSIVE STOP SEALING DEVICE
POUR SYSTEME DE JOINTS D'ARBRE D'UN  FOR SYSTEM OF TREE JOINTS OF A
GROUPE MOTOPOMPE PRIMAIRE.  PRIMARY MOTOR PUMP GROUP.
DOMAINE TECHNIQUE TECHNICAL AREA
Le domaine de l'invention est celui des groupes motopompes primaires de réacteurs nucléaires à eau sous pression (REP). The field of the invention is that of the primary pump units of pressurized water nuclear reactors (PWRs).
L'invention concerne plus un dispositif d'étanchéité à l'arrêt (DEA) passif permettant de contrôler une fuite de fluide de refroidissement primaire résultant de la défaillance du système de joints présent sur le groupe motopompe primaire.  The invention further relates to a passive off-line seal (DEA) for controlling a primary coolant leak resulting from the failure of the seal system present on the primary pump unit.
ETAT DE LA TECHNIQUE STATE OF THE ART
Les dispositifs d'étanchéité à l'arrêt (DEA) ont été développés dans les réacteurs nucléaires à eau sous pression de nouvelles générations pour faire face une défaillance du système de joints du groupe motopompe primaire suite à une situation accidentelle, dite SBO (pour Station Black Out en langue anglaise). Stationary seal devices (DEA) have been developed in new generation pressurized water reactors to deal with a failure of the primary pump unit seals system following an accident situation, known as SBO (for Station). Black Out in English language).
Ainsi, les dispositifs d'étanchéité à l'arrêt doivent, dans cette situation accidentelle et après l'arrêt de la pompe primaire, permettre de contrôler et de stopper une fuite du fluide de refroidissement primaire résultant de la défaillance du système de joints du groupe motopompe primaire.  Thus, in this accidental situation and after stopping the primary pump, the stationary sealing devices must be able to control and stop a leakage of the primary coolant resulting from the failure of the group seal system. primary motor pump.
Classiquement, ce type de dispositif est activé par une source auxiliaire (telle que par exemple un circuit d'azote sous pression) et le déclenchement est piloté par une information délivrée par le contrôle commande du réacteur, en cas de perte des sources de refroidissement du groupe motopompe primaire.  Conventionally, this type of device is activated by an auxiliary source (such as for example a pressurized nitrogen circuit) and the triggering is controlled by information delivered by the control command of the reactor, in case of loss of the cooling sources of the reactor. primary motor pump unit.
Dans le but de d'affranchir de l'utilisation d'une source d'activation, il a été développé un dispositif d'étanchéité à l'arrêt passif ne nécessitant aucun système auxiliaire d'activation, ni d'élaboration d'une information de dé- clenchement au niveau du contrôle commande du réacteur. Un tel dispositif d'étanchéité à l'arrêt passif est décrit dans le document WO 2010/068615. EXPOSE DE L'INVENTION In order to overcome the use of an activation source, it has been developed a passive shutdown sealing device that does not require any auxiliary activation system, nor the development of information triggering at the reactor control. Such a passive off-state sealing device is described in WO 2010/068615. SUMMARY OF THE INVENTION
Dans ce contexte l'invention vise à proposer une amélioration d'un tel dispositif d'étanchéité permettant de garantir l'activation du dispositif d'étanchéité ainsi que son bon fonctionnement lors d'une situation acciden- telle. In this context the invention aims to propose an improvement of such a sealing device to ensure the activation of the sealing device and its proper operation during an accident situation.
A cette fin l'invention propose un dispositif d'étanchéité à l'arrêt passif pour système de joints d'arbre de groupe motopompe primaire comportant :  To this end, the invention proposes a passive shutdown sealing device for a primary pump unit shaft seal system comprising:
- un anneau d'étanchéité fendu présentant une position inactivée dans laquelle un débit de fuite est autorisé et une position activée dans la- quelle ledit anneau stoppe ledit débit de fuite ;  a split seal ring having an inactivated position in which a leakage rate is allowed and an activated position in which said ring stops said leakage rate;
- au moins un piston adapté pour positionner ledit anneau d'étanchéité fendu dans sa position activée ;  at least one piston adapted to position said split seal ring in its activated position;
- des moyens de verrouillage/déverrouillage adaptés pour verrouiller ledit au moins un piston dans sa position inactivée lorsque la tempé- rature dudit moyen de verrouillage/déverrouillage est inférieure à un seuil de température, et pour libérer ledit au moins un piston lorsque la température dudit moyen de verrouillage/déverrouillage est supérieure au dit seuil de température ;  locking / unlocking means adapted to lock said at least one piston in its inactivated position when the temperature of said locking / unlocking means is below a temperature threshold, and to release said at least one piston when the temperature of said locking / unlocking means is greater than said temperature threshold;
- des moyens élastiques adaptés pour déplacer ledit au moins un pis- ton lorsque celui-ci est libéré, de manière à positionner ledit anneau d'étanchéité dans sa position activée.  - Elastic means adapted to move said at least one piston when it is released, so as to position said sealing ring in its activated position.
Grâce à l'invention, il est possible de stopper une fuite du fluide de refroidissement primaire résultant de la défaillance du système de joints du groupe motopompe primaire sans nécessité d'une source auxiliaire d'activation.  Thanks to the invention, it is possible to stop a leakage of the primary coolant resulting from the failure of the seal system of the primary pump unit without the need for an auxiliary source of activation.
La conception du dispositif selon l'invention permet une implantation simplifiée sur les architectures des groupes motopompes primaires déjà en service.  The design of the device according to the invention allows a simplified implementation on the architectures of the primary pump units already in service.
Grâce au dispositif selon l'invention, il est également possible d'ajuster le dispositif aux contraintes de fonctionnement de chaque type de réacteur nucléaire par le réglage de la température d'auto-activation du dispositif, et plus précisément par la modification de la composition de l'élément fusible. Le dispositif d'étanchéité à l'arrêt passif selon l'invention peut également présenter une ou plusieurs des caractéristiques ci-dessous prises individuellement ou selon toutes les combinaisons techniquement possibles : Thanks to the device according to the invention, it is also possible to adjust the device to the operating constraints of each type of nuclear reactor by adjusting the self-activation temperature of the device, and more specifically by modifying the composition. of the fuse element. The passive stopping device according to the invention may also have one or more of the following characteristics taken individually or in any technically possible combination:
- ledit dispositif est adapté pour être intégré sur un système de joints d'un arbre de groupe motopompe primaire en service ;  said device is adapted to be integrated on a system of joints of a primary pump unit shaft in use;
- ledit anneau comporte une paroi latérale chanfreinée adaptée pour coopérer avec une paroi chanfreinée dudit au moins un piston ;  said ring comprises a chamfered side wall adapted to cooperate with a chamfered wall of said at least one piston;
- lesdits moyens de verrouillage/déverrouillage sont adaptés pour se dégrader mécaniquement à partir d'un seuil de température compris entre 80°C et 200°C, avantageusement égal à 150°C ;  said locking / unlocking means are adapted to degrade mechanically from a temperature threshold of between 80 ° C. and 200 ° C., advantageously equal to 150 ° C .;
- ledit anneau d'étanchéité est réalisé dans un matériau polymère résistant à des températures supérieures à 300 °C ;  said sealing ring is made of a polymeric material resistant to temperatures above 300 ° C .;
- ledit anneau d'étanchéité est réalisé en PEEK ;  said sealing ring is made of PEEK;
- ledit anneau d'étanchéité est réalisé en un composite à matrice PEEK chargé fibre de verre ou de carbone ;  said sealing ring is made of a PEEK matrix composite loaded with glass fiber or carbon fiber;
- ledit anneau d'étanchéité est réalisé dans un matériau métallique ; said sealing ring is made of a metallic material;
- ledit anneau d'étanchéité est un matériau composite formé par un noyau métallique et revêtu par un matériau plus malléable que ledit noyau métallique ; said sealing ring is a composite material formed by a metal core and coated with a more malleable material than said metal core;
- ledit matériau plus malléable que ledit noyau métallique est un polymère ou du nickel ou de l'argent ;  said material which is more malleable than said metal core is a polymer or nickel or silver;
- lesdits moyens élastiques sont des ressorts de compression hélicoïdaux ou des ressorts à vagues ou des rondelles élastiques ;  said elastic means are helical compression springs or wave springs or spring washers;
- le dispositif comporte une pluralité de pistons et une pluralité de moyens de verrouillage/déverrouillage répartis sur le pourtour dudit anneau, lesdits pistons et lesdits moyens de verrouillage/déverrouillage étant écartés angulairement les uns des autres d'un angle constant ;  - The device comprises a plurality of pistons and a plurality of locking / unlocking means distributed around the periphery of said ring, said pistons and said locking / unlocking means being spaced angularly from each other by a constant angle;
- ledit dispositif comporte trois pistons et trois moyens de verrou il- lage/déverrouillage ;  said device comprises three pistons and three locking / unlocking means;
- ledit dispositif comporte une bague fendu intégrée dans ledit anneau d'étanchéité et adaptée pour assurer l'étanchéité dudit dispositif en cas de dégradation dudit anneau. L'invention a également pour objet un groupe motopompe primaire comportant : - Said device comprises a split ring integrated in said sealing ring and adapted to seal said device in case of degradation of said ring. The subject of the invention is also a primary pump unit comprising:
un système de joints adapté pour réaliser une fuite contrôlée s'établissant le long d'un chemin de fuite agencé le long de l'arbre 5 pompe pompe du groupe motopompe primaire ;  a seal system adapted to achieve a controlled leak established along a leak path arranged along the pump pump shaft of the primary pump unit;
un dispositif d'étanchéité à l'arrêt passif selon l'invention adapté pour obturer au moins partiellement ledit chemin de fuite dudit système de joints lorsque ledit système de joint est défaillant et lorsque ledit anneau d'étanchéité est activé, de manière à réaliser une fuite contrôl e lée.  a passive stopping device according to the invention adapted to at least partially close said leakage path of said seal system when said seal system fails and when said sealing ring is activated, so as to achieve a controlled leakage.
BREVES DESCRIPTION DES FIGURES BRIEF DESCRIPTION OF THE FIGURES
D'autres caractéristiques et avantages de l'invention ressortiront plus clairement de la description qui en est donnée ci-dessous, à titre indicatif et nullement limitatif, en référence aux figures annexées, parmi lesquelles :Other features and advantages of the invention will emerge more clearly from the description which is given below, by way of indication and in no way limitative, with reference to the appended figures, among which:
15 - la figure 1 illustre une vue en coupe partielle d'un système de joints d'un groupe motopompe primaire FIG. 1 illustrates a partial sectional view of a joint system of a primary motor pump unit.
- premier mode de réalisation d'un dispositif d'étanchéité d'arrêt passif selon l'invention intégré dans un système de joints d'un groupe motopompe primaire ;  first embodiment of a passive stop sealing device according to the invention integrated in a joint system of a primary motor pump unit;
20 - la figure 2 illustre un dispositif d'arrêt passif selon l'invention dans sa position de repos intégré dans un système de joints d'un groupe motopompe primaire ;  FIG. 2 illustrates a passive stopping device according to the invention in its rest position integrated in a joint system of a primary motor pump unit;
- la figure 3 illustre le dispositif d'arrêt selon l'invention, illustré à la figure 2, dans sa position activée.  - Figure 3 illustrates the stop device according to the invention, illustrated in Figure 2, in its activated position.
25 Pour plus de clarté, les éléments identiques ou similaires sont repérés par des signes de références identiques sur l'ensemble des figures.  For the sake of clarity, identical or similar elements are marked by identical reference signs throughout the figures.
DESCRIPTION DETAILLEE D'AU MOINS UN MODE DE REALISATION DETAILED DESCRIPTION OF AT LEAST ONE EMBODIMENT
Les pompes primaires des réacteurs à eau sous pression sont de type centrifuge à axe vertical. L'étanchéité dynamique en sortie d'arbre 10 30 (figure 1 ) est assurée par un système de joints constitué de trois étages. Le premier étage est baptisé joint n° . Le joint n°1 , référencé J1 , est un joint hydrostatique à fuite contrôlée. En fonctionnement normal, un débit de fuite, illustré par la flèche F1 , s'établit le long de l'arbre 10. The primary pumps of pressurized water reactors are centrifugal type with vertical axis. The dynamic seal at the shaft outlet 10 (FIG. 1) is ensured by a joint system consisting of three stages. The first floor is called seal no. The seal No. 1, referenced J1, is a hydrostatic seal leak controlled. In normal operation, a leakage flow, illustrated by the arrow F1, is established along the shaft 10.
En situation accidentelle, la température du fluide en entrée du joint n°1 subit une élévation rapide de température pour atteindre une valeur proche de la température du circuit primaire, soit environ 280°C. A cette température, les performances du joint n°1 sont dégradées ce qui entraine une augmentation très importante de débit de fuite qui peut dépasser 10 m3 par heure. Les dispositifs d'étanchéité à l'arrêt (DEA) passif sont destinés dans cette situation accidentelle à bloquer le chemin de fuite F1 en aval du joint n°1 . In accidental situation, the temperature of the fluid entering the seal No. 1 undergoes a rapid rise in temperature to reach a value close to the temperature of the primary circuit, about 280 ° C. At this temperature, the performance of the seal No. 1 are degraded which causes a very significant increase in leakage rate that can exceed 10 m 3 per hour. In this accidental situation, passive shutdown devices (DEA) are intended to block the leakage path F1 downstream of the seal no.
La figure 1 représente plus particulièrement le chemin de fuite F1 le long de l'arbre 10 entre le joint n°1 et le joint n°2 (non représenté) situé en amont du joint n°1 .  Figure 1 shows more particularly the leakage path F1 along the shaft 10 between the seal No. 1 and the seal No. 2 (not shown) located upstream of the seal No. 1.
Avantageusement, le dispositif DEA 20 selon l'invention est positionné sur le chemin de fuite F1 de manière à pouvoir bloquer l'écoulement du débit de fuite le long de l'arbre 10 en situation accidentelle.  Advantageously, the device DEA 20 according to the invention is positioned on the escape path F1 so as to block the flow of the leakage flow along the shaft 10 in an accident situation.
La figure 2 illustre plus particulièrement le dispositif d'étanchéité 20 lors des conditions normales de fonctionnement du groupe motopompe pri- maire, c'est-à-dire lorsque la température du débit de fuite est inférieure à une valeur seuil.  FIG. 2 illustrates more particularly the sealing device 20 during normal operating conditions of the primary pump unit, that is to say when the temperature of the leakage flow rate is lower than a threshold value.
La figure 3 illustre plus particulièrement le dispositif d'étanchéité lors des situations accidentelles de fonctionnement du groupe motopompe primaire, c'est-à-dire lorsque la température du débit de fuite est supérieure à une valeur seuil.  FIG. 3 more particularly illustrates the sealing device during accidental operating situations of the primary pump unit, that is to say when the temperature of the leakage flow rate is greater than a threshold value.
Le dispositif d'étanchéité à l'arrêt 20 selon l'invention comporte :  The stationary sealing device 20 according to the invention comprises:
- un anneau d'étanchéité fendu 23 positionné concentriquement autour de l'arbre pompe 10 du groupe motopompe primaire ;  a split sealing ring 23 concentrically positioned around the pump shaft 10 of the primary pump unit;
- des moyens 22, de type piston, adaptés pour contraindre l'anneau d'étanchéité fendu 23 dans une position plus fermée que celle correspondant à sa position de fonctionnement dans laquelle le chemin de fuite n'est pas obstrué ; - des moyens de verrouillage/déverrouillage 25 formés par un anneau fusible permettant de verrouiller la position des pistons 22 dans une position, dite position de repos, lorsque la température du débit de fuite est inférieure à une valeur seuil prédéterminée, et permettant de déverrouiller la position des pistons 22 de leur position de repos de manière à atteindre une position, dite position activée, lorsque la température du débit de fuite est supérieure ou égale à la valeur seuil prédéterminée ; - Piston type means 22, adapted to constrain the split seal ring 23 in a more closed position than that corresponding to its operating position in which the leakage path is not obstructed; - Locking / unlocking means 25 formed by a fuse ring for locking the position of the pistons 22 in a position, said rest position, when the leakage flow temperature is below a predetermined threshold value, and to unlock the position of the pistons 22 from their rest position so as to reach a position, called the activated position, when the temperature of the leakage flow rate is greater than or equal to the predetermined threshold value;
- des moyens élastiques 24, tels que par exemple des ressorts de compression, adaptés pour déplacer axialement les différents pistons - Elastic means 24, such as for example compression springs, adapted to move axially the different pistons
22 du dispositif 20 de manière à contraindre axialement l'anneau d'étanchéité fendu 23 autour de l'arbre 10. 22 of the device 20 so as to axially constrain the split sealing ring 23 around the shaft 10.
Les pistons 22 sont répartis sur la circonférence de l'anneau d'étanchéité 23.  The pistons 22 are distributed around the circumference of the sealing ring 23.
L'anneau d'étanchéité 23 présente une première paroi latérale chan- freinée 33 dont la pente est adaptée pour coopérer avec la paroi chanfreinée 32 en partie basse des pistons 22.  The sealing ring 23 has a first stepped side wall 33 whose slope is adapted to cooperate with the chamfered wall 32 at the bottom of the pistons 22.
Le contact entre le piston 22 et l'anneau d'étanchéité fendu 23, et plus particulièrement entre la paroi chanfreinée 32 du piston et la paroi chanfreinée 33 de l'anneau d'étanchéité 23, est assuré par une pluralité de moyens élastiques 24, par exemple des ressorts de compression hélicoïdaux, des ressorts à vague, des rondelles élastiques, repartis sur la circonférence de l'anneau d'étanchéité 23 et exerçant un effort sur les pistons 22.  The contact between the piston 22 and the split sealing ring 23, and more particularly between the chamfered wall 32 of the piston and the chamfered wall 33 of the sealing ring 23, is provided by a plurality of elastic means 24, for example helical compression springs, wave springs, spring washers, distributed around the circumference of the sealing ring 23 and exerting a force on the pistons 22.
Selon le mode de réalisation illustré aux figures 2 et 3, les pistons 22 comportent des alésages 34 adaptés pour loger en partie, ou totalement, les moyens élastiques 24.  According to the embodiment illustrated in FIGS. 2 and 3, the pistons 22 comprise bores 34 adapted to partially or totally house the elastic means 24.
Les moyens de verrouillage/déverrouillage 25 sont formés par un anneau fusible en matériau polymère choisi en fonction de sa température de dégradation et de sa perte de ses caractéristiques mécaniques à partir d'un seuil de température donné. Selon un mode préférentie! de l'invention, le dispositif comporte trois pistons 22 et trois moyens élastiques 24 répartis à 120° sur la circonférence de l'arbre pompe 10 du groupe motopompe primaire. The locking / unlocking means 25 are formed by a fuse ring made of polymer material chosen as a function of its degradation temperature and its loss of its mechanical characteristics from a given temperature threshold. According to a preferential mode! of the invention, the device comprises three pistons 22 and three resilient means 24 distributed at 120 ° on the circumference of the pump shaft 10 of the primary pump unit.
En conditions normales de fonctionnement (figure 2), l'anneau d'étanchéité 23 est maintenu en retrait du chemin de fuite F1 . L'anneau d'étanchéité 23 est verrouillé dans cette position par retour élastique et en prenant appui sur la paroi chanfreinée 32 des pistons 22, les pistons 22 étant maintenus dans leur position de repos par l'anneau fusible 25.  Under normal operating conditions (FIG. 2), the sealing ring 23 is held back from the escape path F1. The sealing ring 23 is locked in this position by elastic return and bearing on the chamfered wall 32 of the pistons 22, the pistons 22 being held in their rest position by the fuse ring 25.
En conditions accidentelles (figure 3), l'augmentation de la tempéra- ture du débit de fuite a pour effet d'augmenter la température au voisinage du dispositif d'arrêt 20, et notamment la température de l'anneau fusible 25. Lorsque la température du débit de fuite atteint une valeur seuil, prédéfinie en fonction de la nature de l'anneau fusible 25, celui-ci se dégrade n'assurant plus par conséquent une résistance mécanique suffisante pour résister à l'effort généré par la pluralité de moyens élastiques 24. La fusion de l'anneau fusible 25 lors de l'augmentation de la température permet ainsi de déclencher le dispositif 20 par le déverrouillage des pistons 22.  Under accident conditions (FIG. 3), the increase in the temperature of the leakage flow has the effect of increasing the temperature in the vicinity of the stop device 20, and in particular the temperature of the fusible ring 25. When the temperature of the leakage flow reaches a threshold value, predefined according to the nature of the fusible ring 25, it degrades thereby no longer ensuring sufficient strength to withstand the effort generated by the plurality of means The melting of the fuse ring 25 during the increase in temperature thus makes it possible to trigger the device 20 by unlocking the pistons 22.
Les pistons 22 n'étant plus maintenus dans leur position de repos, l'effort exercé par les moyens élastiques 24 déplace axialement les pistons jusqu'à leur position activée illustrée à la figure 2.  As the pistons 22 are no longer held in their rest position, the force exerted by the elastic means 24 moves the pistons axially to their activated position illustrated in FIG. 2.
Le déplacement axial des pistons 22 engendre un effort radial sur l'anneau d'étanchéité 23 via la paroi chanfreinée 32 des pistons coopérant par coulissement avec la paroi chanfreinée 33 de l'anneau d'étanchéité 23.  The axial displacement of the pistons 22 generates a radial force on the sealing ring 23 via the chamfered wall 32 of the pistons slidingly cooperating with the chamfered wall 33 of the sealing ring 23.
La contrainte radiale, due au déplacement des pistons 23, va engen- drer une réduction du diamètre de l'anneau d'étanchéité fendu 23 de manière à ce que celui-ci vienne se serrer contre l'arbre du rotor 10.  The radial stress, due to the displacement of the pistons 23, will cause a reduction in the diameter of the split sealing ring 23 so that it comes to tighten against the shaft of the rotor 10.
Ainsi dans la position activée des pistons 22, l'anneau d'étanchéité 23 assure le blocage du chemin de fuite F1 grâce à l'effort exercé par les moyens élastiques 24 puis également par l'effet autoclave induit par l'augmentation de la pression en amont du dispositif d'étanchéité 20 en position activée.  Thus in the activated position of the pistons 22, the sealing ring 23 ensures the blocking of the escape path F1 thanks to the force exerted by the elastic means 24 and also by the autoclave effect induced by the increase of the pressure upstream of the sealing device 20 in the activated position.
Selon un mode de réalisation de l'invention, non limitatif, l'anneau d'étanchéité 23 présente, sur sa deuxième paroi latérale 34, un épaulement adapté pour intégrer une bague fendu 26, dite baque anti-extrusion. La bague fendu 26 est adaptée pour assurer de manière optimum l'étanchéité du dispositif d'arrêt notamment lorsque, durant une situation exceptionnelle, la température est telle que les caractéristiques mécaniques de l'anneau d'étanchéité 23 seraient dégradées. According to one embodiment of the invention, which is not limiting, the sealing ring 23 has, on its second lateral wall 34, a shoulder adapted to incorporate a split ring 26, called anti-extrusion ring. The split ring 26 is adapted to ensure optimum sealing of the stop device especially when, during an exceptional situation, the temperature is such that the mechanical characteristics of the sealing ring 23 are degraded.
Le choix du polymère de l'anneau fusible 25 est réalisé de manière à ce qu'il puisse résister à l'effort exercé par les moyens élastiques 24 jusqu'à un seul de température compris entre 80°C et 200°C et avantageusement égal à 150°C.  The choice of the polymer of the fuse ring 25 is made so that it can withstand the force exerted by the elastic means 24 to a single temperature between 80 ° C and 200 ° C and advantageously equal at 150 ° C.
L'anneau d'étanchéité 23 du dispositif d'arrêt 20 peut être réalisé dans un matériau polymère résistant à de hautes températures (i.e. supérieures à 300°C), tel que par exemple du PEEK ou un composite PEEK chargé de fibres de verre ou de carbone. L'utilisation d'un tel matériau permet d'obtenir à haute température, un anneau d'étanchéité dans un état caoutchoutique lui permettant de se déformer pour épouser la géométrie de son environnement et ainsi assurer une meilleure qualité d'étanchéité.  The sealing ring 23 of the stop device 20 may be made of a polymer material resistant to high temperatures (ie greater than 300 ° C.), such as, for example, PEEK or a PEEK composite filled with glass fibers or of carbon. The use of such a material allows to obtain at high temperature, a sealing ring in a rubbery state allowing it to deform to match the geometry of its environment and thus ensure a better sealing quality.
L'anneau d'étanchéité fendu 23 du dispositif 20 peut également être réalisé dans un matériau métallique. Dans ce cas, un débit de fuite résiduel sera attendu du fait des jeux existants entre l'anneau d'étanchéité 23 et les pièces en son contact. Toutefois, l'utilisation d'un matériau métallique permet de sécuriser la tenue du dispositif et notamment de l'anneau d'étanchéité en cas d'activation dudit dispositif avant l'arrêt complet de la rotation de l'arbre de la pompe.  The split sealing ring 23 of the device 20 may also be made of a metallic material. In this case, a residual leakage flow will be expected because of the existing gaps between the sealing ring 23 and the parts in contact therewith. However, the use of a metallic material makes it possible to secure the holding of the device and in particular of the sealing ring in the event of activation of said device before complete stopping of the rotation of the pump shaft.
L'anneau d'étanchéité fendu 23 peut également être réalisé dans un matériau composite formé par un noyau métallique revêtu d'un matériau plus malléable que le noyau, tel que par exemple un polymère, du nickel ou encore de l'argent. Le matériau périphérique plus malléable que le noyau permettra de combler les jeux existants entre les différentes pièces par déformation de la couche superficielle. En cas d'usure de la couche superfi- cielle provoquée par la rotation de l'arbre, le noyau métallique plus dense permet de garantir une limitation du débit de fuite. Les pistons 22 ainsi que la bague fendu anii-extrusion 26 sont avantageusement réalisés dans matériaux métalliques de type aciers inoxydables. The split sealing ring 23 may also be made of a composite material formed by a metal core coated with a more malleable material than the core, such as for example a polymer, nickel or silver. The peripheral material more malleable than the core will fill the existing gaps between the different pieces by deformation of the surface layer. In case of wear of the surface layer caused by the rotation of the shaft, the denser metal core makes it possible to guarantee a limitation of the leakage rate. The pistons 22 and the split anii-extrusion ring 26 are advantageously made of stainless steel type metal materials.

Claims

REVENDICATIONS
Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire caractérisé en ce qu'il comporte : Passive stop sealing device (20) for a primary pump unit shaft seal system, characterized in that it comprises:
- un anneau d'étanchéité fendu (23) présentant une position inactivée dans laquelle un débit de fuite est autorisé et une position activée dans laquelle ledit anneau stoppe ledit débit de fuite ;  - A split seal ring (23) having an inactivated position in which a leakage rate is allowed and an activated position in which said ring stops said leakage rate;
- au moins un piston (22) adapté pour positionner ledit anneau d'étanchéité fendu (23) dans sa position activée ;  at least one piston (22) adapted to position said split sealing ring (23) in its activated position;
- des moyens de verrouillage/déverrouillage (25) adaptés pour verrouiller ledit au moins un piston (22) dans sa position inactivée lorsque la température dudit moyen de verrouillage/déverrouillage est inférieure à un seuil de température, et pour libérer ledit au moins un piston (22) lorsque la température dudit moyen de verrouillage/déverrouillage est supérieure au dit seuil de température ;  locking / unlocking means (25) adapted to lock said at least one piston (22) in its inactivated position when the temperature of said locking / unlocking means is below a temperature threshold, and to release said at least one piston (22) when the temperature of said locking / unlocking means is greater than said temperature threshold;
- des moyens élastiques (24) adaptés pour déplacer ledit au moins un piston (22) lorsque ledit piston est libéré, de manière à positionner ledit anneau d'étanchéité (23) dans sa position activée.  - Elastic means (24) adapted to move said at least one piston (22) when said piston is released, so as to position said sealing ring (23) in its activated position.
Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon la revendication précédente caractérisé en ce que ledit dispositif est adapté pour être intégré sur un système de joints d'un arbre de groupe motopompe primaire en service. Passive stop sealing device (20) for a primary pump unit shaft seal system according to the preceding claim, characterized in that said device is adapted to be integrated on a joint system of a motor pump group shaft. primary service.
Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications précédentes caractérisé en ce que ledit anneau (23) comporte une pa- roi latérale chanfreinée adaptée pour coopérer avec une paroi chan- freinée dudit au moins un piston (22). Passive stop sealing device (20) for a primary pump unit shaft seal system according to one of the preceding claims, characterized in that said ring (23) comprises a chamfered side king adapted to cooperate with a chanted wall of said at least one piston (22).
Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications précédentes caractérisé en ce que lesdits moyens de verrouillage/déverrouillage (25) sont adaptés pour se dégrader mécaniquement à partir d'un seuil de température compris entre 80°G et 200°C, avantageusement égal à 150°C. Passive stop sealing device (20) for a primary pump unit shaft seal system according to one of the preceding claims, characterized in that said locking / unlocking means (25) are adapted to mechanically degrade at from a temperature threshold between 80 ° C and 200 ° C, preferably equal to 150 ° C.
Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications précédentes caractérisé en ce que ledit anneau d'étanchéité (23) est réalisé dans un matériau polymère résistant à des températures supérieures à 300 °C. Passive stop sealing device (20) for a primary pump unit shaft seal system according to one of the preceding claims, characterized in that said sealing ring (23) is made of a polymeric material resistant to temperatures above 300 ° C.
Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon la revendication précédente caractérisé en ce que ledit anneau d'étanchéité (23) est réalisé en PEEK. Passive stop sealing device (20) for a primary pump unit shaft seal system according to the preceding claim, characterized in that said sealing ring (23) is made of PEEK.
7. Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications 5 à 6 caractérisé en ce que ledit anneau d'étanchéité (23) est réalisé en un composite à matrice PEEK chargé fibre de verre ou de carbone. Passive shutoff seal device (20) for a primary pump unit shaft seal system according to one of claims 5 to 6, characterized in that said sealing ring (23) is made of a PEEK matrix composite filled with fiberglass or carbon.
8. Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications 1 à 4 caractérisé en ce que ledit anneau d'étanchéité (23) est réalisé dans un matériau métallique. Passive shutoff seal device (20) for a primary pump unit shaft seal system according to one of claims 1 to 4, characterized in that said sealing ring (23) is made of a metallic material.
9. Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications 1 à 4 caractérisé en ce que ledit anneau d'étanchéité (23) est un maté- riau composite formé par un noyau métallique et revêtu par un matériau plus malléable que ledit noyau métallique. Passive shutoff seal device (20) for a primary pump unit shaft seal system according to one of claims 1 to 4, characterized in that said sealing ring (23) is a composite material formed by a metal core and coated with a more malleable material than said metal core.
10. Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon la revendication 9 caractérisé en ce que ledit matériau plus malléable que ledit noyau métallique est un polymère ou du nickel ou de l'argent. Passive shutoff seal device (20) for a primary pump unit shaft seal system according to claim 9, characterized in that said more malleable material than said metal core is a polymer or nickel or aluminum. 'money.
1 1 . Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications précédentes caractérisé en ce que lesdits moyens élastiques (24) sont des ressorts de compression hélicoïdaux ou des ressorts à vagues ou des rondelles élastiques. 12. Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications précédentes caractérisé en ce qu'il comporte une pluralité de pistons (23) et une pluralité de moyens de verrouillage/déverrouillage (25) répartis sur le pourtour dudit anneau (23), lesdits pistons (23) et lesdits moyens de verrouillage/déverrouillage (25) étant écartés angulairement les uns des autres d'un angle constant. 1 1. Passive stop sealing device (20) for a primary pump unit shaft seal system according to one of the preceding claims, characterized in that said elastic means (24) are helical compression springs or compression springs. waves or elastic washers. Passive shutoff seal device (20) for primary pump unit shaft seal system according to one of the preceding claims, characterized in that it comprises a plurality of pistons (23) and a plurality of locking / unlocking means (25) distributed around the periphery of said ring (23), said pistons (23) and said locking / unlocking means (25) being spaced angularly from each other by a constant angle.
13. Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications précédentes caractérisé en ce qu'il comporte trois pistons (23) et trois moyens de verrouillage/déverrouillage (25). Passive shutdown sealing device (20) for a primary pump unit shaft seal system according to one of the preceding claims, characterized in that it comprises three pistons (23) and three locking means / unlocking (25).
14. Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications précédentes caractérisé en ce qu'il comporte une bague fendu (26) intégrée dans ledit anneau d'étanchéité (23) et adaptée pour assurer l etanchéité dudit dispositif (20) en cas de dégradation dudit anneau (23). Passive stop seal device (20) for a primary pump unit shaft seal system according to one of the preceding claims, characterized in that it comprises a split ring (26) integrated into said ring of sealing (23) and adapted to ensure the sealing of said device (20) in the event of degradation of said ring (23).
15. Groupe motopompe primaire caractérisé en ce qu'il comporte - un système de joints adapté pour réaliser une fuite contrôlée s'établissant le long d'un chemin de fuite agencé le long de l'arbre pompe du groupe motopompe primaire ; 15. Primary pump unit characterized in that it comprises - A seal system adapted to achieve a controlled leak established along a leak path arranged along the pump shaft of the primary pump unit;
- un dispositif d'étanchéité à l'arrêt passif selon l'une des revend i- cations précédentes adapté pour obturer au moins partiellement ledit chemin de fuite dudit système de joints lorsque ledit système de joint est défaillant et lorsque ledit anneau d'étanchéité est activé, de manière à réaliser une fuite contrôlée.  a passive stopping device according to one of the preceding claims adapted to at least partially close said leakage path of said seal system when said seal system fails and when said sealing ring is activated, in order to achieve a controlled leak.
EP13702052.5A 2012-02-01 2013-01-31 Passive shutdown sealing device for a system of shaft seals of a reactor coolant pump unit Active EP2809971B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI201330224A SI2809971T1 (en) 2012-02-01 2013-01-31 Passive shutdown sealing device for a system of shaft seals of a reactor coolant pump unit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1250957A FR2986300B1 (en) 2012-02-01 2012-02-01 PASSIVE STOP SEALING DEVICE FOR SHAFT JOINT SYSTEM OF PRIMARY MOTOR PUMP GROUP
PCT/EP2013/051928 WO2013113827A1 (en) 2012-02-01 2013-01-31 Passive shutdown sealing device for a system of shaft seals of a reactor coolant pump unit

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EP2809971A1 true EP2809971A1 (en) 2014-12-10
EP2809971B1 EP2809971B1 (en) 2016-04-06

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JP (1) JP6240094B2 (en)
KR (1) KR101790837B1 (en)
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RU (1) RU2608449C2 (en)
SI (1) SI2809971T1 (en)
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JP6240094B2 (en) 2017-11-29
CA2863412A1 (en) 2013-08-08
CN104169618A (en) 2014-11-26
RU2014135453A (en) 2016-03-27
KR20140117540A (en) 2014-10-07
US10385974B2 (en) 2019-08-20
US20150108721A1 (en) 2015-04-23
PL2809971T3 (en) 2016-11-30
ZA201405674B (en) 2017-06-28
CN104169618B (en) 2016-08-24
SI2809971T1 (en) 2016-08-31
BR112014018800B1 (en) 2020-12-15
FR2986300A1 (en) 2013-08-02
WO2013113827A1 (en) 2013-08-08
JP2015507195A (en) 2015-03-05
FR2986300B1 (en) 2014-03-07
KR101790837B1 (en) 2017-10-26
BR112014018800A8 (en) 2017-07-11
ES2584385T3 (en) 2016-09-27
CA2863412C (en) 2019-11-26
EP2809971B1 (en) 2016-04-06
BR112014018800A2 (en) 2017-06-20
IN2014DN06483A (en) 2015-06-12
RU2608449C2 (en) 2017-01-18

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